ash: significant overhaul of redirect saving logic
New code is similar to what hush is doing.
Make CLOSED to -1: same as dash.
popredir() loses "restore" parameter: same as dash.
COPYFD_RESTORE bit is no longer necessary.
This change fixes this interactive bug:
$ ls -l /proc/$$/fd 10>&-
ash: can't set tty process group: Bad file descriptor
ash: can't set tty process group: Bad file descriptor
[1]+ Done(2) ls -l /proc/${\$}/fd 10>&4294967295
function old new delta
unwindredir 29 27 -2
tryexec 154 152 -2
evaltree 503 501 -2
evalcommand 1369 1367 -2
cmdloop 187 185 -2
redirect 1029 1018 -11
popredir 153 123 -30
need_to_remember 36 - -36
is_hidden_fd 68 - -68
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 0/7 up/down: 0/-155) Total: -155 bytes
text data bss dec hex filename
914572 485 6848 921905 e1131 busybox_old
914553 485 6848 921886 e111e busybox_unstripped
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
657e9005a9
commit
035486c750
306
shell/ash.c
306
shell/ash.c
@ -5192,7 +5192,7 @@ stoppedjobs(void)
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#undef EMPTY
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#undef CLOSED
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#define EMPTY -2 /* marks an unused slot in redirtab */
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#define CLOSED -3 /* marks a slot of previously-closed fd */
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#define CLOSED -1 /* marks a slot of previously-closed fd */
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/*
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* Handle here documents. Normally we fork off a process to write the
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@ -5349,51 +5349,107 @@ dup2_or_raise(int from, int to)
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}
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return newfd;
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}
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static int
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fcntl_F_DUPFD(int fd, int avoid_fd)
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{
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int newfd;
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repeat:
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newfd = fcntl(fd, F_DUPFD, avoid_fd + 1);
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if (newfd < 0) {
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if (errno == EBUSY)
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goto repeat;
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if (errno == EINTR)
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goto repeat;
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}
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return newfd;
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}
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static int
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xdup_CLOEXEC_and_close(int fd, int avoid_fd)
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{
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int newfd;
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repeat:
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newfd = fcntl(fd, F_DUPFD, avoid_fd + 1);
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if (newfd < 0) {
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if (errno == EBUSY)
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goto repeat;
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if (errno == EINTR)
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goto repeat;
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/* fd was not open? */
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if (errno == EBADF)
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return fd;
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ash_msg_and_raise_perror("%d", newfd);
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}
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fcntl(newfd, F_SETFD, FD_CLOEXEC);
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close(fd);
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return newfd;
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}
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/* Struct def and variable are moved down to the first usage site */
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struct two_fd_t {
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int orig, copy;
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struct squirrel {
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int orig_fd;
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int moved_to;
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};
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struct redirtab {
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struct redirtab *next;
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int pair_count;
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struct two_fd_t two_fd[];
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struct squirrel two_fd[];
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};
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#define redirlist (G_var.redirlist)
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enum {
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COPYFD_RESTORE = (int)~(INT_MAX),
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};
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static int
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need_to_remember(struct redirtab *rp, int fd)
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static void
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add_squirrel_closed(struct redirtab *sq, int fd)
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{
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int i;
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if (!rp) /* remembering was not requested */
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return 0;
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if (!sq)
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return;
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for (i = 0; i < rp->pair_count; i++) {
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if (rp->two_fd[i].orig == fd) {
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/* already remembered */
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return 0;
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for (i = 0; sq->two_fd[i].orig_fd != EMPTY; i++) {
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/* If we collide with an already moved fd... */
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if (fd == sq->two_fd[i].orig_fd) {
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/* Examples:
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* "echo 3>FILE 3>&- 3>FILE"
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* "echo 3>&- 3>FILE"
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* No need for last redirect to insert
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* another "need to close 3" indicator.
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*/
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TRACE(("redirect_fd %d: already moved or closed\n", fd));
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return;
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}
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}
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return 1;
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TRACE(("redirect_fd %d: previous fd was closed\n", fd));
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sq->two_fd[i].orig_fd = fd;
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sq->two_fd[i].moved_to = CLOSED;
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}
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/* "hidden" fd is a fd used to read scripts, or a copy of such */
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static int
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is_hidden_fd(struct redirtab *rp, int fd)
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save_fd_on_redirect(int fd, int avoid_fd, struct redirtab *sq)
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{
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int i;
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struct parsefile *pf;
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int i, new_fd;
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if (fd == -1)
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if (avoid_fd < 9) /* the important case here is that it can be -1 */
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avoid_fd = 9;
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#if JOBS
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if (fd == ttyfd) {
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/* Testcase: "ls -l /proc/$$/fd 10>&-" should work */
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ttyfd = xdup_CLOEXEC_and_close(ttyfd, avoid_fd);
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TRACE(("redirect_fd %d: matches ttyfd, moving it to %d\n", fd, ttyfd));
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return 1; /* "we closed fd" */
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}
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#endif
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/* Are we called from redirect(0)? E.g. redirect
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* in a forked child. No need to save fds,
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* we aren't going to use them anymore, ok to trash.
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*/
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if (!sq)
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return 0;
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/* Check open scripts' fds */
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pf = g_parsefile;
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/* If this one of script's fds? */
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if (fd != 0) {
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struct parsefile *pf = g_parsefile;
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while (pf) {
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/* We skip pf_fd == 0 case because of the following case:
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/* We skip fd == 0 case because of the following:
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* $ ash # running ash interactively
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* $ . ./script.sh
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* and in script.sh: "exec 9>&0".
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@ -5401,22 +5457,50 @@ is_hidden_fd(struct redirtab *rp, int fd)
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* it's still ok to use it: "read" builtin uses it,
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* why should we cripple "exec" builtin?
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*/
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if (pf->pf_fd > 0 && fd == pf->pf_fd) {
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return 1;
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if (fd == pf->pf_fd) {
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pf->pf_fd = xdup_CLOEXEC_and_close(fd, avoid_fd);
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return 1; /* "we closed fd" */
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}
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pf = pf->prev;
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}
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}
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if (!rp)
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return 0;
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/* Check saved fds of redirects */
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fd |= COPYFD_RESTORE;
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for (i = 0; i < rp->pair_count; i++) {
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if (rp->two_fd[i].copy == fd) {
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return 1;
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/* Check whether it collides with any open fds (e.g. stdio), save fds as needed */
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/* First: do we collide with some already moved fds? */
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for (i = 0; sq->two_fd[i].orig_fd != EMPTY; i++) {
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/* If we collide with an already moved fd... */
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if (fd == sq->two_fd[i].moved_to) {
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new_fd = fcntl_F_DUPFD(fd, avoid_fd);
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sq->two_fd[i].moved_to = new_fd;
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TRACE(("redirect_fd %d: already busy, moving to %d\n", fd, new_fd));
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if (new_fd < 0) /* what? */
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xfunc_die();
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return 0; /* "we did not close fd" */
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}
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if (fd == sq->two_fd[i].orig_fd) {
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/* Example: echo Hello >/dev/null 1>&2 */
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TRACE(("redirect_fd %d: already moved\n", fd));
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return 0; /* "we did not close fd" */
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}
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}
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return 0;
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/* If this fd is open, we move and remember it; if it's closed, new_fd = CLOSED (-1) */
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new_fd = fcntl_F_DUPFD(fd, avoid_fd);
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TRACE(("redirect_fd %d: previous fd is moved to %d (-1 if it was closed)\n", fd, new_fd));
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if (new_fd < 0) {
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if (errno != EBADF)
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xfunc_die();
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/* new_fd = CLOSED; - already is -1 */
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}
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sq->two_fd[i].moved_to = new_fd;
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sq->two_fd[i].orig_fd = fd;
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/* if we move stderr, let "set -x" code know */
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if (fd == preverrout_fd)
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preverrout_fd = new_fd;
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return 0; /* "we did not close fd" */
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}
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/*
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@ -5431,109 +5515,80 @@ redirect(union node *redir, int flags)
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{
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struct redirtab *sv;
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int sv_pos;
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int fd;
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int newfd;
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if (!redir)
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return;
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sv_pos = 0;
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sv = NULL;
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INT_OFF;
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if (flags & REDIR_PUSH)
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sv = redirlist;
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sv_pos = 0;
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do {
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int right_fd = -1;
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int fd;
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int newfd;
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int close_fd;
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int closed;
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fd = redir->nfile.fd;
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if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
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right_fd = redir->ndup.dupfd;
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//bb_error_msg("doing %d > %d", fd, right_fd);
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/* redirect from/to same file descriptor? */
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if (right_fd == fd)
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continue;
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/* "echo >&10" and 10 is a fd opened to a sh script? */
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if (is_hidden_fd(sv, right_fd)) {
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errno = EBADF; /* as if it is closed */
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ash_msg_and_raise_perror("%d", right_fd);
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}
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newfd = -1;
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//bb_error_msg("doing %d > %d", fd, newfd);
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newfd = redir->ndup.dupfd;
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close_fd = -1;
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} else {
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newfd = openredirect(redir); /* always >= 0 */
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if (fd == newfd) {
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/* Descriptor wasn't open before redirect.
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* Mark it for close in the future */
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if (need_to_remember(sv, fd)) {
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goto remember_to_close;
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}
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/* open() gave us precisely the fd we wanted.
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* This means that this fd was not busy
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* (not opened to anywhere).
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* Remember to close it on restore:
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*/
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add_squirrel_closed(sv, fd);
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continue;
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}
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close_fd = newfd;
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}
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#if BASH_REDIR_OUTPUT
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redirect_more:
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#endif
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if (need_to_remember(sv, fd)) {
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/* Copy old descriptor */
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/* Careful to not accidentally "save"
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* to the same fd as right side fd in N>&M */
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int minfd = right_fd < 10 ? 10 : right_fd + 1;
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#if defined(F_DUPFD_CLOEXEC)
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int copy = fcntl(fd, F_DUPFD_CLOEXEC, minfd);
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#else
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int copy = fcntl(fd, F_DUPFD, minfd);
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#endif
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if (copy == -1) {
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int e = errno;
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if (e != EBADF) {
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/* Strange error (e.g. "too many files" EMFILE?) */
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if (newfd >= 0)
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close(newfd);
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errno = e;
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ash_msg_and_raise_perror("%d", fd);
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/* NOTREACHED */
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}
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/* EBADF: it is not open - good, remember to close it */
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remember_to_close:
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copy = CLOSED;
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} else { /* fd is open, save its copy */
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#if !defined(F_DUPFD_CLOEXEC)
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fcntl(copy, F_SETFD, FD_CLOEXEC);
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#endif
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/* "exec fd>&-" should not close fds
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* which point to script file(s).
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* Force them to be restored afterwards */
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if (is_hidden_fd(sv, fd))
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copy |= COPYFD_RESTORE;
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}
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/* if we move stderr, let "set -x" code know */
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if (fd == preverrout_fd)
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preverrout_fd = copy;
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sv->two_fd[sv_pos].orig = fd;
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sv->two_fd[sv_pos].copy = copy;
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sv_pos++;
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}
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if (newfd < 0) {
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/* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
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if (redir->ndup.dupfd < 0) { /* "fd>&-" */
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/* Don't want to trigger debugging */
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if (fd != -1)
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if (fd == newfd)
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continue;
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/* if "N>FILE": move newfd to fd */
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/* if "N>&M": dup newfd to fd */
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/* if "N>&-": close fd (newfd is -1) */
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IF_BASH_REDIR_OUTPUT(redirect_more:)
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closed = save_fd_on_redirect(fd, /*avoid:*/ newfd, sv);
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if (newfd == -1) {
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/* "N>&-" means "close me" */
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if (!closed) {
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/* ^^^ optimization: saving may already
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* have closed it. If not... */
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close(fd);
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}
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} else {
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dup2_or_raise(redir->ndup.dupfd, fd);
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}
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} else if (fd != newfd) { /* move newfd to fd */
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///TODO: if _newfd_ is a script fd or saved fd, then simulate EBADF!
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//if (newfd == ttyfd) {
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// errno = EBADF;
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// ash_msg_and_raise_perror("A %d", newfd);
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//}
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//if (newfd == g_parsefile->pf_fd) {
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// errno = EBADF;
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// ash_msg_and_raise_perror("B %d", newfd);
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//}
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dup2_or_raise(newfd, fd);
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#if BASH_REDIR_OUTPUT
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if (!(redir->nfile.type == NTO2 && fd == 2))
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#endif
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close(newfd);
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}
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if (close_fd >= 0) /* "N>FILE" or ">&FILE" or heredoc? */
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close(close_fd);
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#if BASH_REDIR_OUTPUT
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if (redir->nfile.type == NTO2 && fd == 1) {
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/* We already redirected it to fd 1, now copy it to 2 */
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newfd = 1;
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/* ">&FILE". we already redirected to 1, now copy 1 to 2 */
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fd = 2;
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newfd = 1;
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close_fd = -1;
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goto redirect_more;
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}
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#endif
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}
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} while ((redir = redir->nfile.next) != NULL);
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INT_ON;
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@ -5542,7 +5597,7 @@ redirect(union node *redir, int flags)
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// dash has a bug: since REDIR_SAVEFD2=3 and REDIR_PUSH=1, this test
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// triggers for pure REDIR_PUSH too. Thus, this is done almost always,
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// not only for calls with flags containing REDIR_SAVEFD2.
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// We do this unconditionally (see code above).
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// We do this unconditionally (see save_fd_on_redirect()).
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//if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
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// preverrout_fd = copied_fd2;
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}
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@ -5557,7 +5612,7 @@ redirectsafe(union node *redir, int flags)
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SAVE_INT(saveint);
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/* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
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err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
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err = setjmp(jmploc.loc); /* was = setjmp(jmploc.loc) * 2; */
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if (!err) {
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exception_handler = &jmploc;
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redirect(redir, flags);
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@ -5591,7 +5646,7 @@ pushredir(union node *redir)
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sv = ckzalloc(sizeof(*sv) + i * sizeof(sv->two_fd[0]));
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sv->pair_count = i;
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while (--i >= 0)
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sv->two_fd[i].orig = sv->two_fd[i].copy = EMPTY;
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sv->two_fd[i].orig_fd = sv->two_fd[i].moved_to = EMPTY;
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sv->next = redirlist;
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redirlist = sv;
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return sv->next;
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@ -5601,7 +5656,7 @@ pushredir(union node *redir)
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* Undo the effects of the last redirection.
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*/
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static void
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popredir(int drop, int restore)
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popredir(int drop)
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{
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struct redirtab *rp;
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int i;
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@ -5611,20 +5666,19 @@ popredir(int drop, int restore)
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INT_OFF;
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rp = redirlist;
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for (i = 0; i < rp->pair_count; i++) {
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int fd = rp->two_fd[i].orig;
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int copy = rp->two_fd[i].copy;
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int fd = rp->two_fd[i].orig_fd;
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int copy = rp->two_fd[i].moved_to;
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if (copy == CLOSED) {
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if (!drop)
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close(fd);
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continue;
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}
|
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if (copy != EMPTY) {
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if (!drop || (restore && (copy & COPYFD_RESTORE))) {
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copy &= ~COPYFD_RESTORE;
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if (!drop) {
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/*close(fd);*/
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dup2_or_raise(copy, fd);
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}
|
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close(copy & ~COPYFD_RESTORE);
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close(copy);
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}
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}
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redirlist = rp->next;
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@ -5636,7 +5690,7 @@ static void
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unwindredir(struct redirtab *stop)
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{
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while (redirlist != stop)
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popredir(/*drop:*/ 0, /*restore:*/ 0);
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popredir(/*drop:*/ 0);
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}
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@ -7715,7 +7769,7 @@ tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) const char *cmd, char **argv, c
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clearenv();
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while (*envp)
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putenv(*envp++);
|
||||
popredir(/*drop:*/ 1, /*restore:*/ 0);
|
||||
popredir(/*drop:*/ 1);
|
||||
run_applet_no_and_exit(applet_no, cmd, argv);
|
||||
}
|
||||
/* re-exec ourselves with the new arguments */
|
||||
@ -8754,7 +8808,7 @@ evaltree(union node *n, int flags)
|
||||
status = evaltree(n->nredir.n, flags & EV_TESTED);
|
||||
}
|
||||
if (n->nredir.redirect)
|
||||
popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
|
||||
popredir(/*drop:*/ 0);
|
||||
goto setstatus;
|
||||
case NCMD:
|
||||
evalfn = evalcommand;
|
||||
@ -9902,7 +9956,7 @@ evalcommand(union node *cmd, int flags)
|
||||
|
||||
out:
|
||||
if (cmd->ncmd.redirect)
|
||||
popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
|
||||
popredir(/*drop:*/ cmd_is_exec);
|
||||
unwindredir(redir_stop);
|
||||
unwindlocalvars(localvar_stop);
|
||||
if (lastarg) {
|
||||
@ -13727,7 +13781,7 @@ int ash_main(int argc UNUSED_PARAM, char **argv)
|
||||
* Testcase: ash -c 'exec 1>&0' must not complain. */
|
||||
// if (!sflag) g_parsefile->pf_fd = -1;
|
||||
// ^^ not necessary since now we special-case fd 0
|
||||
// in is_hidden_fd() to not be considered "hidden fd"
|
||||
// in save_fd_on_redirect()
|
||||
evalstring(minusc, sflag ? 0 : EV_EXIT);
|
||||
}
|
||||
|
||||
|
||||
@ -20,10 +20,15 @@ eval "find_fds $fds"
|
||||
|
||||
# Shell should not lose that fd. Did it?
|
||||
find_fds
|
||||
test x"$fds1" = x"$fds" && { echo "Ok: script fd is not closed"; exit 0; }
|
||||
test x"$fds1" = x"$fds" \
|
||||
&& { echo "Ok: script fd is not closed"; exit 0; }
|
||||
|
||||
# One legit way to handle it is to move script fd. For example, if we see that fd 10 moved to fd 11:
|
||||
test x"$fds1" = x" 10>&- 3>&-" && \
|
||||
test x"$fds" = x" 11>&- 3>&-" \
|
||||
&& { echo "Ok: script fd is not closed"; exit 0; }
|
||||
|
||||
echo "Bug: script fd is closed"
|
||||
echo "fds1:$fds1"
|
||||
echo "fds2:$fds"
|
||||
exit 1
|
||||
|
||||
|
||||
2
shell/ash_test/ash-redir/redir_to_bad_fd255.right
Normal file
2
shell/ash_test/ash-redir/redir_to_bad_fd255.right
Normal file
@ -0,0 +1,2 @@
|
||||
./redir_to_bad_fd255.tests: line 2: 255: Bad file descriptor
|
||||
OK
|
||||
3
shell/ash_test/ash-redir/redir_to_bad_fd255.tests
Executable file
3
shell/ash_test/ash-redir/redir_to_bad_fd255.tests
Executable file
@ -0,0 +1,3 @@
|
||||
# ash uses fd 10 (usually) for reading the script
|
||||
echo LOST >&255
|
||||
echo OK
|
||||
2
shell/ash_test/ash-redir/redir_to_bad_fd3.right
Normal file
2
shell/ash_test/ash-redir/redir_to_bad_fd3.right
Normal file
@ -0,0 +1,2 @@
|
||||
./redir_to_bad_fd3.tests: line 2: 3: Bad file descriptor
|
||||
OK
|
||||
3
shell/ash_test/ash-redir/redir_to_bad_fd3.tests
Executable file
3
shell/ash_test/ash-redir/redir_to_bad_fd3.tests
Executable file
@ -0,0 +1,3 @@
|
||||
# ash uses fd 10 (usually) for reading the script
|
||||
echo LOST >&3
|
||||
echo OK
|
||||
@ -20,10 +20,15 @@ eval "find_fds $fds"
|
||||
|
||||
# Shell should not lose that fd. Did it?
|
||||
find_fds
|
||||
test x"$fds1" = x"$fds" && { echo "Ok: script fd is not closed"; exit 0; }
|
||||
test x"$fds1" = x"$fds" \
|
||||
&& { echo "Ok: script fd is not closed"; exit 0; }
|
||||
|
||||
# One legit way to handle it is to move script fd. For example, if we see that fd 10 moved to fd 11:
|
||||
test x"$fds1" = x" 10>&- 3>&-" && \
|
||||
test x"$fds" = x" 11>&- 3>&-" \
|
||||
&& { echo "Ok: script fd is not closed"; exit 0; }
|
||||
|
||||
echo "Bug: script fd is closed"
|
||||
echo "fds1:$fds1"
|
||||
echo "fds2:$fds"
|
||||
exit 1
|
||||
|
||||
|
||||
1
shell/hush_test/hush-redir/redir_to_bad_fd255.right
Normal file
1
shell/hush_test/hush-redir/redir_to_bad_fd255.right
Normal file
@ -0,0 +1 @@
|
||||
hush: can't duplicate file descriptor: Bad file descriptor
|
||||
3
shell/hush_test/hush-redir/redir_to_bad_fd255.tests
Executable file
3
shell/hush_test/hush-redir/redir_to_bad_fd255.tests
Executable file
@ -0,0 +1,3 @@
|
||||
# ash uses fd 10 (usually) for reading the script
|
||||
echo LOST >&255
|
||||
echo OK
|
||||
1
shell/hush_test/hush-redir/redir_to_bad_fd3.right
Normal file
1
shell/hush_test/hush-redir/redir_to_bad_fd3.right
Normal file
@ -0,0 +1 @@
|
||||
hush: can't duplicate file descriptor: Bad file descriptor
|
||||
3
shell/hush_test/hush-redir/redir_to_bad_fd3.tests
Executable file
3
shell/hush_test/hush-redir/redir_to_bad_fd3.tests
Executable file
@ -0,0 +1,3 @@
|
||||
# ash uses fd 10 (usually) for reading the script
|
||||
echo LOST >&3
|
||||
echo OK
|
||||
Loading…
Reference in New Issue
Block a user